Hydraulic Clutch – Parts, Working, Application, Diagram

”Discover the benefits of a hydraulic clutch and how it differs from a traditional clutch. Learn What Is Hydraulic Clutch? its components and how it works in this informative guide.”

What Is A Hydraulic Clutch?

What Is A Hydraulic Clutch
Hydraulic Clutch Diagram

Definition :

A hydraulic clutch is a type of clutch that uses a hydraulic system to transfer force from the clutch pedal to the clutch mechanism. When you press the clutch pedal, the system pushes fluid, which makes the slave cylinder move and disengage the clutch. This allows the driver to change gears smoothly and with less effort than a manual clutch.

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How Hydraulic clutch Is Different From Normal Clutches?

Hydraulic clutch works on the principle of highly pressurized clutch fluid. Compared to the cable in the mechanical clutch, it consists of a fluid reservoir, a master cylinder, and a slave cylinder. Due to the presence of a master cylinder and slave cylinder, they are easier to modulate and have a more consistent lever bridge.

The hydraulic clutch uses hydraulic force in the fluid to achieve a smooth and consistent springer clutch pedal, rather than using a cable. Even if the clutch plates are damaged, the clutch pedal returns to its original state in the case of a hydraulic clutch. But in the case of a mechanical cable clutch, the wires or cables used to activate can break or malfunction after aging.

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Parts Of The Hydraulic Clutch

Parts Of The Hydraulic Clutch
Parts Of The Hydraulic Clutch

1. Clutch Pedal

The clutch pedal is the primary part that attaches the clutch to a vehicle. The clutch disengagement process begins when the driver presses the clutch pedal.

2. Master Cylinder

As the name suggests, the primary hydraulic cylinder applies clutch fluid at high pressure with the help of pistons present inside the cylinder. We connect the clutch fluid reservoir to the master cylinder, which supplies the clutch fluid when you press the clutch pedal.

3. Pressure Pipe

It supplies fluids from the master cylinder to the slave cylinder at high pressure to operate the clutch.

4. Slave Cylinder

The slave cylinder is the second hydraulic cylinder present in the system. It consists of a push piston rod that is attached to the clutch release fork. The liquid from the master cylinder enters the slave cylinder and presses against the push piston rod which in turn executes the release fork.

5. Release Fork

The clutch release fork is attached to the slave cylinder at one end and the other end is connected to the clutch shaft to which the clutch release bearing is attached. When the clutch pedal is pressed, it is used to press the release bearings to put pressure on the diaphragm.

6. Release Bearing

Clutch release bearings are mounted on the clutch shaft. When the clutch pedal is pressed it presses the diaphragm in the middle of the spring.

7. Diaphragm Spring

The diaphragm is a semi-circular or ‘C’ shaped spring. It is applied to the pressure plate and is used to maintain pressure on the clutch plate. When the clutch pedal is pressed, the diaphragm is pushed into the middle of the spring and the spring pulls the pressure plate away from the clutch plate.

8. Pressure Plate

The purpose of the pressure plate is to push the friction plate against the discus. It is placed under pressure with the help of a diaphragm spring. When the clutch pedal is pressed, the diaphragm spring pressure plate pulls away from the clutch plate, separating the engine from the transmission.

9. Splined Sleeves

The split sleeves are located between the friction lining of the clutch plate and the pressure plate. The pressure plate keeps the split sleeves under pressure to keep the clutch connected. When the pressure plate releases pressure the split sleeve goes away and it separates the engine from the transmission.

10. Clutch Plate –

We place the clutch plate between the pressure plate and the flywheel. It has an abrasive lining on both sides of its surface. The friction surface creates friction between the discus and the pressure plate. The friction between them is responsible for generating or interrupting the flow of electricity between the engine and the transmission.

11. Flywheel

At one end, the wheel connects to the engine crankshaft, and at the other end, it connects to the clutch plate. The disc is responsible for transferring the flow of electricity from the engine to the transmission through the clutch plate. When you press the clutch pedal, it interrupts the linkage between the flywheel and the clutch plate. This causes the inability of power transfer and allows the gear to change smoothly.

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Function Of Hydraulic Clutch

Function Of Hydraulic Clutch
Function Of Hydraulic Clutch

To produce or interrupt the power flow between the transmission (powered shaft) and the engine (driver shaft). To protect the transmission and engine from overloading and self-lubricating systems. It is possible to drive easily from a halt.

Using the force of hydraulic fluid to connect and remove the clutch. To adjust the height of the clutch pedal itself using the same hydraulic mechanism as the braking system and to maintain the collision point of the clutch at the same point throughout the lifetime of the clutch.

Place a closed system between the master cylinder and the slave cylinder and there is no air inside. The clutch master cylinder should act according to the force generated by the clutch pedal action.

The hydraulic pipe should move the pressurized fluid between the cylinders without any leakage, as this can trap the air in the system and affect the clutch mechanism.

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Working Of Hydraulic Clutch

1. Engagement Of Clutch

The clutch is turned on when electricity flows between the engine and the transmission. This happens when the driver leaves the clutch pedal after changing gears. The release of the clutch pedal releases the fluid into the cylinder. This fork, bearing and diaphragm bring spring back to their original location.

As soon as the diaphragm returns to its original position, the splint sleeves move to the original position to bring the pressure plate in contact with the clutch plate. The pressure plate presses the clutch plate against the disc causing friction. This causes the plates to rotate at the same speed along the wheel. Thus there is a flow of electricity between the engine and the transmission.

2. Disengagement Of Clutch

The clutch remains engaged when the engine and transmission are rotating together at the same speed under pressure, with the flywheel and clutch plate also rotating together. To change gears smoothly, you need to separate the transmission from the engine, and this process is known as clutch disengagement. The driver initiates the disengagement process by pressing the clutch pedal.

The clutch pedal attaches to the master cylinder. The purpose of the master cylinder is to compress the fluid present in the reservoir under high pressure using the piston present inside it. We transfer this highly pressurized fluid from the master cylinder to the slave cylinder using hydraulic pipes.

The slave cylinder pushes out the push piston rod inside it due to the high-pressure fluid from the master cylinder. “The push piston rod actuates the clutch release fork, which is connected to the clutch shaft. When the clutch release fork is actuated, it pushes the clutch release bearings that are mounted on the clutch shaft.”

The middle of the diaphragm spring attaches the clutch release bearing. The spring pressure plate contracts and extends its surface using the diaphragm. The middle pressure of the diaphragm pulls the plate away when the release fork pushes the release effect.

The pressure plate removes the split sleeves, releasing pressure on the clutch plate. The loss of frictional force between the clutch plate and the disc occurs as a result. The frictional relationship between the plates and the flywheel determines the flow of electricity, and it gets interrupted when there is no friction. As a result, the clutch falls apart and allows for the changing of gears.

Advantages Of Hydraulic Clutch

  1. Hydraulic clutches provide smoother and more consistent lever bridges. It takes less time to react and does not require more force from the driver in the case of mechanical clutches.
  2. Hydraulic clutches require less maintenance as they are self-lubricating and have less friction.
  3. The hydraulic action in a clutch pedal self-adjusts its height, eliminating the need for periodic adjustments like those required for a mechanical cable clutch.
  4. In addition, due to the hydraulic system, no cable is present inside the system, which may require periodic maintenance due to damage.
  5. Hydraulic clutches have higher longevity because friction is low and does not cause sudden cable breakdown like a mechanical cable-activated clutch.
  6. The quality of hydraulic clutches is higher than that of mechanical clutches.

Disadvantages Of Hydraulic Clutch

  1. The hydraulic clutch consists of pipes and there are several parts in the system that require a very large area.
  2. The slave cylinder sometimes drains out the fluid due to hydraulic error, which can damage the clutch plate.
  3. The hydraulic pipe in the system contains plastic to metal, which will rot after a certain period of use.
  4. After a certain time of use, the clutch fluid becomes contaminated with impurities. In addition, parts need to maintain an optimal level of fluid in the reservoir to avoid damage. Therefore, periodic change in a fluid is necessary for functioning.
  5. The clutch fluid needs bleeding to avoid trapped air during the replacement process, which is time-consuming.
  6. The hydraulic clutch system should use standard clutch fluid. Incorrect fluids can damage the seal in the system.
  7. Compared with a mechanical clutch, a hydraulic clutch is a more complex system. The hydraulic clutch is based on a master cylinder, slave cylinder, hydraulic pipe, and fluid, while the mechanical clutch requires only one cable wire to operate.

Application Of Hydraulic Clutch

  1. Reputed auto manufacturers prefer hydraulic clutches as they ensure quality and have lower failure rates.
  2. Hydraulic clutches are also currently use in heavy vehicles.
  3. Both single-plate and multi-plate clutches can use hydraulic plates.
  4. Industries extensively use self-adjusting and self-lubricating features for various applications.


What Is Clutch?

It is the most important part of the engine in an AUTOMOBILE. A clutch uses to transfer rotating motion or torque from one shaft to another shaft when requires. The torque developed by the engine at the initial speed is very low. Therefore it is impossible to start the engine under load.

What Is A Hydraulic Clutch?

A hydraulic clutch is a type of automotive clutch that uses hydraulic fluid instead of a cable to move the clutch plate. These clutches have a master cylinder attached to the clutch pedal, which carries the fluid inside the clutch lining with high pressure when the driver presses the clutch pedal to detach the clutch.

Is a hydraulic clutch better in a car?

The new gearbox can be too heavy to function by cable and may require a lot of effort and even take a long time to function. Rapid activation of hydraulic clutches enables quick and easy gear changes. Hence, It would not be wrong to say that hydraulic clutches are good.

What causes a hydraulic clutch to fail?

Sudden failure is often accompanied by broken or loose clutch cables, linkable, or a failed hydraulic master. Cylinder issues can cause the slave to fail. Additionally, there may be a leakage in the hydraulic line or the disc can become contaminated with dirt or debris.

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